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use json_syntax::{MetaValue, Value};
use locspan::Stripped;

/// JSON-LD comparison.
pub trait Compare {
	fn compare(&self, other: &Self) -> bool;
}

impl<T: Compare> Compare for Stripped<T> {
	fn compare(&self, other: &Self) -> bool {
		self.0.compare(&other.0)
	}
}

impl<M> Compare for MetaValue<M> {
	fn compare(&self, other: &Self) -> bool {
		self.value().compare(other.value())
	}
}

impl<M> Compare for Value<M> {
	fn compare(&self, other: &Self) -> bool {
		match (self, other) {
			(Self::Null, Self::Null) => true,
			(Self::Boolean(a), Self::Boolean(b)) => a == b,
			(Self::Number(a), Self::Number(b)) => a == b,
			(Self::String(a), Self::String(b)) => a == b,
			(Self::Array(a), Self::Array(b)) => {
				if a.len() == b.len() {
					let mut selected = Vec::new();
					selected.resize(b.len(), false);

					'next_item: for item in a {
						for (other, selected) in b.iter().zip(selected.iter_mut()) {
							if !*selected && item.compare(other) {
								*selected = true;
								continue 'next_item;
							}
						}

						return false;
					}

					true
				} else {
					false
				}
			}
			(Self::Object(a), Self::Object(b)) => {
				if a.len() == b.len() {
					for entry in a {
						match b.get_unique(&*entry.key).ok().expect("invalid JSON-LD") {
							Some(value) => {
								if !entry.value.compare(value) {
									return false;
								}
							}
							None => return false,
						}
					}

					true
				} else {
					false
				}
			}
			_ => false,
		}
	}
}